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Posted to dev@hive.apache.org by "Harish Butani (JIRA)" <ji...@apache.org> on 2013/03/06 05:40:13 UTC

[jira] [Commented] (HIVE-4041) Support multiple partitionings in a single Query

    [ https://issues.apache.org/jira/browse/HIVE-4041?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13594355#comment-13594355 ] 

Harish Butani commented on HIVE-4041:
-------------------------------------

attached Design notes
                
> Support multiple partitionings in a single Query
> ------------------------------------------------
>
>                 Key: HIVE-4041
>                 URL: https://issues.apache.org/jira/browse/HIVE-4041
>             Project: Hive
>          Issue Type: Bug
>          Components: PTF-Windowing
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>         Attachments: WindowingComponentization.pdf
>
>
> Currently we disallow queries if the partition specifications of all Wdw fns are not the same. We can relax this by generating multiple PTFOps based on the unique partitionings in a Query. For partitionings that only differ in sort, we can introduce a sort step in between PTFOps, which can happen in the same Reduce task.

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